chrono-node-rs 0.1.0

Behaviour-matched Rust port of chrono-node: natural-language date parsing, checked against chrono-node's own output
Documentation 
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//! upstream `locales/it/parsers/ITSlashMonthFormatParser.ts`.

use crate::common::word_boundary::{WithWordBoundary, WordBoundaryParser};
use crate::core::chrono::{Extracted, Parser};
use crate::core::components::Component;
use crate::core::configuration::Flags;
use crate::core::context::ParsingContext;
use crate::core::regex::{JsRegex, RegexMatch};
use crate::core::utils::js::js_parse_int;
use crate::js_regex;

pub const UPSTREAM: &str = "ITSlashMonthFormatParser";

pub fn create(_flags: &Flags) -> Box<dyn Parser> {
    Box::new(WithWordBoundary::new(ItSlashMonthFormatParser))
}

const MONTH_GROUP: usize = 1;
const YEAR_GROUP: usize = 2;

struct ItSlashMonthFormatParser;

impl WordBoundaryParser for ItSlashMonthFormatParser {
    fn inner_pattern(&self, _context: &ParsingContext) -> JsRegex {
        js_regex!(r"([0-9]|0[1-9]|1[012])/([0-9]{4})", "i").clone()
    }

    fn inner_extract(&self, context: &ParsingContext, m: &mut RegexMatch) -> Extracted {
        let year = js_parse_int(m.get(YEAR_GROUP).unwrap_or(""));
        let month = js_parse_int(m.get(MONTH_GROUP).unwrap_or(""));
        let (Some(year), Some(month)) = (year, month) else {
            return Extracted::None;
        };

        let mut components = context.create_parsing_components(&[]);
        components.imply(Component::Day, 1).assign(Component::Month, month).assign(Component::Year, year);
        Extracted::Components(components)
    }
}